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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2020 SUSE Linux Products GmbH. All Rights Reserved.
#
# FS QA Test No. btrfs/221
#
# Test that an incremental send operation emits the correct path for link and
# rename operation after swapping the names and locations of several inodes in
# a way that creates a nasty dependency of rename and link operations. Notably
# one file has its name and location swapped with a directory for which it used
# to have a directory entry in it.
#
. ./common/preamble
_begin_fstest auto quick send
# Override the default cleanup function.
_cleanup()
{
cd /
rm -fr $send_files_dir
rm -f $tmp.*
}
. ./common/filter
_supported_fs btrfs
_require_test
_require_scratch
_require_fssum
send_files_dir=$TEST_DIR/btrfs-test-$seq
rm -fr $send_files_dir
mkdir $send_files_dir
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
touch $SCRATCH_MNT/a
touch $SCRATCH_MNT/b
mkdir $SCRATCH_MNT/testdir
# We want "a" to have a lower inode number than its parent directory, so it
# was created before the directory and then moved into it.
mv $SCRATCH_MNT/a $SCRATCH_MNT/testdir/a
# Filesystem looks like:
#
# . (ino 256)
# |----- testdir/ (ino 259)
# | |----- a (ino 257)
# |
# |----- b (ino 258)
#
$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
$SCRATCH_MNT/mysnap1 > /dev/null
$BTRFS_UTIL_PROG send -f $send_files_dir/1.snap \
$SCRATCH_MNT/mysnap1 2>&1 1>/dev/null | _filter_scratch
# Now rename 259 to "testdir_2", then change the name of 257 to "testdir" and
# make it a direct descendant of the root inode (256). Also create a new link
# for inode 257 with the old name of inode 258. By swapping the names and
# location of several inodes and create a nasty dependency chain of rename and
# link operations.
mv $SCRATCH_MNT/testdir/a $SCRATCH_MNT/a2
touch $SCRATCH_MNT/testdir/a
mv $SCRATCH_MNT/b $SCRATCH_MNT/b2
ln $SCRATCH_MNT/a2 $SCRATCH_MNT/b
mv $SCRATCH_MNT/testdir $SCRATCH_MNT/testdir_2
mv $SCRATCH_MNT/a2 $SCRATCH_MNT/testdir
# Filesystem now looks like:
#
# . (ino 256)
# |----- testdir_2/ (ino 259)
# | |----- a (ino 260)
# |
# |----- testdir (ino 257)
# |----- b (ino 257)
# |----- b2 (ino 258)
#
$BTRFS_UTIL_PROG subvolume snapshot -r $SCRATCH_MNT \
$SCRATCH_MNT/mysnap2 > /dev/null
$BTRFS_UTIL_PROG send -p $SCRATCH_MNT/mysnap1 -f $send_files_dir/2.snap \
$SCRATCH_MNT/mysnap2 2>&1 1>/dev/null | _filter_scratch
$FSSUM_PROG -A -f -w $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
$FSSUM_PROG -A -f -w $send_files_dir/2.fssum \
-x $SCRATCH_MNT/mysnap2/mysnap1 $SCRATCH_MNT/mysnap2
# Now recreate the filesystem by receiving both send streams and verify we get
# the same content that the original filesystem had.
_scratch_unmount
_scratch_mkfs >>$seqres.full 2>&1
_scratch_mount
$BTRFS_UTIL_PROG receive -f $send_files_dir/1.snap $SCRATCH_MNT > /dev/null
# The receive operation below used to fail because when attemping to create the
# hard link named "b" for inode 257, the link operation contained a target path
# of "o259-6-0/a", which caused the receiver process to fail because inode 259
# was not yet orphanized (renamed to "o259-6-0"), it still had the name "testdir"
# when the link operation was issued.
$BTRFS_UTIL_PROG receive -f $send_files_dir/2.snap $SCRATCH_MNT > /dev/null
$FSSUM_PROG -r $send_files_dir/1.fssum $SCRATCH_MNT/mysnap1
$FSSUM_PROG -r $send_files_dir/2.fssum $SCRATCH_MNT/mysnap2
status=0
exit
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